Page 2: Gibbs Free Energy and Cellular Work

This page explores the concept of Gibbs Free Energy and its application to biological systems. The equation ΔG = ΔH - TΔS helps determine whether reactions will occur spontaneously and how much energy is available for cellular work.

Definition: Gibbs Free Energy (G) represents the energy available to do useful work in a system.

Highlight: Reactions with negative ΔG are spontaneous (exergonic), while those with positive ΔG require energy input (endergonic).

Example: Cellular work includes chemical reactions, transport across membranes, and mechanical movements.

Page 3: ATP and Energy Coupling

The third page details ATP's role as an energy coupler and the process of phosphorylation in cellular energy transfer. ATP hydrolysis powers endergonic reactions through energy coupling.

Vocabulary: Phosphorylation is the process of adding a phosphate group to a molecule.

Definition: Energy coupling occurs when an exergonic reaction powers an endergonic reaction through ATP.

Highlight: ATP regeneration is crucial for maintaining cellular energy balance and is powered by cellular respiration.

Page 4: Enzyme Structure and Function

The final page examines enzyme structure, function, and regulation in metabolic processes. Enzymes work through specific mechanisms and are subject to various regulatory controls.

Definition: The active site is the specific region of an enzyme where substrate binding occurs.

Example: Competitive inhibitors block the active site, while non-competitive inhibitors bind elsewhere to change enzyme shape.

Highlight: Allosteric regulation allows for feedback inhibition and precise control of enzyme activity.

Vocabulary: Induced fit describes how enzyme and substrate shapes change upon binding to enhance catalysis.

Page 1: Fundamentals of Metabolism and Thermodynamics

The first page introduces core concepts of metabolism and thermodynamics in biological systems. Metabolic pathways consist of enzyme-catalyzed reactions that either build up (anabolic) or break down (catabolic) molecules. Energy transformations follow fundamental thermodynamic laws within open biological systems.

Definition: Metabolism is the sum of all chemical reactions occurring in living organisms.

Vocabulary: Anabolic pathways form bonds and build molecules, while catabolic pathways break bonds and break down molecules.

Highlight: The First Law of Thermodynamics states that energy cannot be created or destroyed, only transformed.

Example: Energy exists in different forms, including kinetic (motion, heat, light) and potential (stored in chemical bonds).